html,body {
  width: 100%;
  height: 100%;
  background-color: #d0fadd2c;
}
#header {
 width: 1000px;
 height: 40px;
 line-height: 40px;
 margin: 30px auto;
 background: orange;
 box-sizing: border-box;
 font-size: 16px;
 padding: 0 10px;
 color: white;
 letter-spacing: 1px;
}
#header span {
  margin-right: 10px;
}
#header a {
  color: white;
  margin-right: 15px;
  position: relative;
}
#header a:hover {
  color: orangered;
}
#header a i {
  width: 0;
  height: 0;
  border:4px solid transparent;
  position: absolute;
}
#header a i.up {
  border-bottom-color: white;
  top:3px;
}
#header a i.down {
  border-top-color: white;
  top:15px;
}

#header a i.up.bg {
  border-bottom-color: red;
}
#header a i.down.bg {
  border-top-color: red;
}
/* 
=====================================
*/
#cardBox {
  width: 1000px;
  margin: 20px auto;
  display: flex;
  flex-wrap: wrap;
  
}
#cardBox li {
  width: 24%;
  box-sizing: border-box;
  padding: 10px;
  background: rgba(172, 255, 47, 0.336);
  margin: 0 .5% 10px .5%;
}

#cardBox li img {
  width: 100%;
  transition: all .2s;

}
#cardBox li img:hover {
  transform: scale(1.05);
}
#cardBox li span {
  display: block;
  margin-bottom: 5px;
  font-size: 18px;
  margin-left: 10px;
  color: orangered;
  transition: all .2s;
  cursor: pointer;
}
#cardBox li span:hover {
  text-shadow: 2px 2px 5px #000;

}

